Question

Tìm x :

a) x : 0,125 - x = 45                 b) x : 0,2 + x nhân 5 - x : 0,25 = 54 ,75 

  ac lm giúp e với ạ

Answer 1

a) x : 0,125 - x = 45

x * 1/8 - x = 45

x * (1/8 - 1) = 45

x * -7/8 = 45

x = -360/7

 

b) x : 0,2 + x * 5 - x : 0,25 = 54,75 

x * 1/5 + x * 5 - x * 1/4 = 54,75

x * (1/5 + 5 - 1/4) = 54,75

x * 99/20 = 54,75

x = 365/33

Answer 2

a) \(x:0,125-x=45\)

\(x:\dfrac{1}{8}-x=45\\ x\times8-x=45\\ x\times\left(8-1\right)=45\\ 7\times x=45\\ x=45:7\\ x=\dfrac{45}{7}\)

b) \(x:0,2+x\times5-x:0,25=54,75\)

\(x:\dfrac{1}{5}+x\times5-x:\dfrac{1}{4}=54,75\\ x\times5+x\times5-x\times4=54,75\\ x\times\left(5+5-4\right)=54,75\\ x\times6=54,75\\ x=54,75:6\\ x=9,125\)